creed



G. E. CREED STENCIL DUPLICATNG MACHINE 1929 5 4sneev5-sheet 1 Jan. 27',1931.

Filed Dec. 18,

G. E; CREED '.lan. 27, 1931.

STNCIL DUPLICATING MACHINE 5 Sheets-Sheet A 2 Filed Deo.` 18, 1929 Jan.27, 1931. l G. E. CREED 1,790,407

STENCIL DUPLICATING MACHINE Filed Deo. 1a, 1929 5 snets-sneet 4 @g/eefWwf@ Jan. 27, 1931. G. E. CREED 1,790,407

s'rENcIL DUPLICATING MACHINE Filed Dec. 18, 1929 Smeets-sheet 5'Patented dan. 27, i931 entran stares mono? am oFFIcE GEORGE ERNESTGREED, F LONDON, ENGLAND, ASSIGNOR T0 D. GESTETNER, LMITED, 0F LONDON,ENGLAND STENCIL DUPLICATING MACHINE Application filed Becember 18, i929,Serial No. 415,106, and in Great Britain December 20, 1929.

This invention relates to stencil-duplicating machines.

Hitherto the general practice has been to provide in the stencilheading, which is no rmally a piece of relatively thick paper gummed orotherwise secured to the stencil sheet proper, a plurality of holes orslots which engage pins provided upon a rigid member or stencilfastening means secured i@ to er forming part of the duplicating mainthe stencil heading chine ln certain cases the holes have been in theform cf keyhole slots while the pins have been under-cut so that afterthe heads of the pins have passed through the enlargedportions of theslots the stencil may be moved relatively to the fastening means whilestill engaged thereby in order that the heads of the pins may preventthe stencil heading and, therefore, the stencil from becoming detached.

rlhe object of the present invention is to facilitate the engagement ofthe stencil with the fastening means on the duplicating machine. p

The invention consists broadly in a stencil fastening means normallysecured to or formy ing part of the duplicating machine comprising meansadapted to displace one or more tongues, iiaps or equivalent elementsformed and an abutment against which the fore or outer edge of suchtongues, flaps or equivalent elements will be caused to bear and thusoperate vto engage the stencil heading with the fastening means.

The 'abutment is preferably so formed that, in view of the shape of thefore or. outer edge of the tongues, flaps or equivalent elements tensionon the stencil in a direction parallel with its direction of travel whenon the machine will assist in appropriately positioning or centring thestencil sheet.

' Preferably, in accordance with the invention, the stencil fasteningmeans constitutes a housing for the greater portion of the stencilheading, lthe abutment being locatedin the housing and means beingprovided whereby the tongues, flaps or equivalent elements may bedefinitely displaced within the housing to engage against the abutmentand thereby ensure the stencil being secured in position.

Conveniently, in accordance with thev invention, the fastening meanscomprises an upper and a lower member between which the stencil headingmay be inserted, a connection between the upper and lower membersadapted topermit the same to be moved relatively to one another tofacilitate the insertion of the stencil heading, abutment members on theupper member and means adapted to constrain the upper member towards thelower member to cause or assist in causing the flaps or tongues onthe-stencil heading to be engaged against the abutment members.

ln one construction, in accordance with the invention, the fasteningmeans comprises a lower member dimensioned to extend the whole width ofthe inking .means of the duplicating machine, an upper member hingedthereto on an axis parallel with the longer edges of said members, anabutment provided on-the upper member and within 'the space between themembers, means adapted to constrain the free edges of the two members toapproach one another and means located between thetwo members adaptedpositively tc displace the tongues or flaps on the stencil heading tobring the fore edges of the tongues or flaps into position against theabutment.

The hinged connection between the upper and lower members of thefastening means and the means adapted to constrain the free edges of thetwo members to approach one another are preferably so designed to enablethe free edge of the stencil heading to be pushed between the members,thus moving the upper away from the lower member until when the stencilheading is in position the upper member will descend, thus operating todisplace or assistin displacing jhe tongues or flaps relatively to theremaining portion ofthe stencil heading and to cause the free edges ofthe tongues or aps to bear against the abutment. A

On the lower member elevations may be provided adapted to assistincausing the free edges of the tongues or flaps on the stencil heading tobear against the abutment.

Alternatively such elevations or projections may be provided on therigid member secured to one end of a sheet of flexible foraminousmaterial which is normally associated with a stencil when mounted on theduplicating machine and'is located between the stencil and the inkingmeans of the duplicating machine.

Either the upper or lower member of the stencil fastening means may bearranged to engage the ilexible foraminous sheet, for instance, a sheetof silk, usually referred to as the silk carrier. Such a flexibleforaminous sheet is normally provided at each of its two opposite endswith rigid members adapted to facilitate its being secured in positionon the duplicating machine and to enable the said rigid member to besecured in position on the machine it may be provided with pins orprojections adapted to engage holes formed in the lower member of thefastening means or in extensions provided thereon. To facilitate theengagement of the pins or projections with the holes in the lower memberof the fastening means spring elements may be provided on the latter.

Such spring elements may cach compris(` a short length of steel springone secured to each end of the stencil fastening means in such mannerand position that they will operate to force the pins or projections onthe rigid member secured to the flexible stencil carrier into theapertures provided on the stencil fastening means.

Alterna-tively the lower member may be provided with spring elementsadapted to engage the stencil fastening means, or any other convenientdevice for securing such v connection may be provided.

The invention w libe described further in detail and by way of examplewith reference to the accompanying drawings, in which Figure 1 is afragmentary view in elevation of a stencil sheet showing the stencilheading, and Y' Figure 2 is a similar view of a porous sheet having aheading adapted to be engaged by fastening means in accordance with theinvention;

Figure 3 is a view in elevation of the stencil fastening means inaccordance with the invention which will normally be secured to or formpart of the duplicating machine;

Figure 4 is a corresponding view of a construction incorporating a silkcarriery provided on each of its two opposite ends with rigid members asillustrated in front and side elevations, respectively, in Figures 5 and6.

Figure 7 is a sectional view on a larger scale of an alternativeconstruction of the said means, and

Figure 8 is a front elevation of a generally known type of duplicatingmachine provided with stencil fastening means as illustrated in Figures3 to 6 or in Figure 7 Figure 9 being a corresponding end elevationthereof, while Figures 10 and 11 are similar views of a duplicatingmachine of another generally known type provided with stencil fasteningmeans as illustrated in Figures 3 to 6 or in Figure 7.

Figures 1Q and 13 are, respectively, fragmentary views in elevation ofVan alternative form of stencil heading provided on a stencil sheet and abacking sheet respectively.

Referring to Figure 1, 1 represents a portion of the backing sheet ofthe stencil sheet, 2 a stencil sheet attached thereto, 3 the stencilheading which forms a continuation of the backing sheet which willnormally be a sheet of relatively stiff paper doubled over adjacent toone end to provide a reinforced and strengthened portion forming thestencil heading, 4 are tongues or flaps formed in the stencil heading byproviding therein V- shaped incisions 5, the top edge of the stencilheading being cut back to form recesses G in the vicinity of theincisions to prevent this portion of the heading being distorted inconsequence of the displacement of the tongues when the stencil sheet isplaced on the stencilduplicating machine. In addition, deeper recesses 7are provided in the stencil heading, as illustrated in Figure 1, theserecesses being provided in the construction illustrated to enable thestencil sheet to be mounted on the duplicating machine in associationwith a porous sheet as illustrated in Figure 2.

1n Figure 2, 8 illustrates the backing sheet for the porous sheet 9,which may be a sheet of yoshino paper, the backing sheet being providedmerely for the purpose of facilitating the handling of a material of theflimsy character of yoshino paper or other suitable highly porousmaterial.

The backing sheet which is engaged with the porous sheet at one endconstitutes the heading 10 adapted to be secured to the stencilfastening means of the duplicating machine and this heading is furnishedwith tongues 11 by forming in the material of the heading V-shapedincisions 12. Adjacent to these incisions recesses 18 are provided inthe stencil hea-ding for the purpose explained in 1 connection withFigure 1 and other deeper recesses 14 are provided in the stencilheading. These deeper recesses, as will be seen, are arranged so that,'when a structure as illustrated in Figure 1 isA superimposed on astructure as illustrated in Figure 2 with the edges-of the sheets inalignment, they will not be in'register with the deep'recesses 7 in thestencil sheet but with the tongues therein, while the deep recesses 7 inthe heading of the stencil sheet will be in register with the tongues 11on the heading of the porous sheet, the purpose of this arrangementbeing to enable the tongues on the two sheets to be disadapted toconstrain the placed independently of one another in a mannerhereinafter to be described.

Referring to Figures 3, 4, and 7, which illustrate the stencil fasteningmeans normally secured to or forming part of the duplicating machine, 15is the lower member thereof which will be located adjacent to the inkingmeans of the duplicating machine and'which extends the whole widththereof and 16 is an upper memberI hinged to the lower member by the pin17 and associated with a spring 18 free edges of the two members toapproach one another, a tongue 19 being provided, for. moving the uppermember relatively to the lower member in opposition to the spring whenengaging a or porous sheet with the fastening means.

The upper member 16 is, operation, ward limits 21 of these recessesforming abutments for the tongues on the stencil heading and the headingof the porous sheet.

ln the construction illustrated in Figure 7, on the lower member 15 ofthe stencil fastening means are provided a plurality of tongues 22certain of which are arranged to displace the tongues on the-stencilheading or the tongues in the heading of the porous sheet in the `manner-shown 'in this ligure thereby causing the forward edge of the tongues 4or 11, as the case may be, to bear against the forward limits 21 of therecesses in the upper member which form an abutment for the tongues. n

, In the construction illustrated in Figure 4 the elevations'23 are theequivalents of the elevations 22 in Figure 7 but instead of being formedon the lower member `of the stencil fastening means they are .formed inthe'rigid member 24 which is secured to one of the silk carrier 25, the.other end of which is secured in the rigid member 26. The mem-A by apressing -ber 24 is provided also with projections 27 on its under faceadapted to engage in corresponding holes 28 in the lower member of thestencil'fastening means and to assist in appropriately ositioning therigid member in the stencil astening means a recess 29 is provided inits rear edge anda pin 30 is provided in the lower member of the stencilfastening means so that the projections 27 may be engaged in the holes28. When so engaged in the stencil fastening means the elevations 23, aswill be seen, will be in position to displace the tongues on the headingof the stencil sheet and on the heading of the porous sheet. Y v

As shown in Figures 3, 4, and 7 the stencil fastening means is securedas in known con-` structions vwhen it is to be associated with a machineasillustrated in Figures 8 and 9 to a length of flexible and ink-proofsheet material 31, commonly known as the protector, which in turn isconnected to a. strip ofv and the protector 31 will also formed withrecesses 20, the forrigid material 32 provided with slides 33 engaged bypins 34 on the rigid member. These slides are located adjacent to holes35 designed to engage pins 36 (see Figures 8 and 9) on the flexiblesteel bands 37, the upturned ends 38 of the slides 33 being arranged tobe engaged by loops 39 in the ends of the springs 40 secured to therigid member 26 provided on one end of the silk-carrier. In this way thesilk carrier, with the rigid member 24 engaged by the -stencil fasteningmeans will be drawn tightly over the inking rollers be drawn taut.

lin Figures 8 and 9, 41 are the side members of the duplicating machine,42' and 43 vthe inking cylinders and 44 the pressure roller, adapted topress the paper on which the impression of the matter cut in the stencilis to be formed against the stencil.

1n the construction illustrated in Figures 10 and 11the stencilfastening means proper constructed generallyas shown in Figure 7 will besecured directly to the inking drum 45 in a manner similar to that inwhich the hitherto known ystencil fastening means are secured inposition in such machines, 46 indicating the frame of the machine and 47the pressure roller. j

rlhe stencil heading may be varied inform and construction withinrelatively wide limits for use in connection with a stencil fasteningmeans within the scope of the present invention and Figures 12 and 13show one of several possible alternative constructions of heading.

1n Figure 12, 48 indicates the backing sheet of a stencil sheet,^49 themain portion of the heading which is formed with recesses 50 leavingV-shaped elements between them, extremities 51 of which when bent alongthe dotted lines 52 constituting tongues or flaps adapted to bedisplaced in a manner similar to the tongues 7 in the constructionillustrated in Figure 1 by the elevations 22 or 23 on the stencilfastening means (see Figures 4 and 7) the slots 53 being provided toenable the said elevations to effect such displacement.

In Figure 13, 54 indicates the backing of the porous sheet, 55 theextremities of V- shaped elements forming part of the heading which whenbent over alon 56 will constitute tongues adapted to be displaced byelevations on the stencil fastening means entering the holes 57.

Having now described my invention,what I' claim as new and desire tosecure by Letters Patent-is 1. A stencil fastening means for aduplicating machine, comprising a lower member dimensioned to extendIthe -whole width of the inking means of the duplicating machine, anupper member hinged t ereto on an axis parallel withthe longer edges ofsaid members, an abutment'provided on the upper membei` the the dottedline and within the space between the members, means adapted toconstrain the free edges of the two members to approach one anotherandmeans located between the two members adapted'positively to displacetongues on the stencil heading to bring the fore edges of the tonguesinto position against the abutment.

2. A stencil fastening means for a duplicating machine, comprising alower member dimensioned to extend the whole width of the inking-meansof the duplicating machine7 an upper member hinged thereto on an axisparallel with the longer edges of said members, an abutment provided onthe upper member and within the space between the members, means adaptedto constrain the free edges of the two members to approach one another,and elevations on the lower member adapted to assist in causing the freeedges of tongues on the stencil heading to bear against the abutment.

3. A stencil fastening means for a duplicating machine comprising alower member dimensioned to extend the whole width of the inking meansof the duplicating machine, an upper member hinged thereto on an axisparallel with the longer edges ot said members, an abutment provided onthe upper member and within the space between the members, means adaptedto constrain the free edges of the two members to approach one another,elevations on the lower member adapted to assist in causing the freeedges of the tongues on the stencil heading to bear against theabutment, and means adapted to engage a flexible oraminous sheetconstituting a support for the stencil sheet when mounted on theduplicating machine.

l. A stencil fastening means for a duplieating machine, comprising alower member dimensioned to extend the whole width of the inking meansof the duplicating machine, an upper member secured thereto, meansadapted to force the upper member towards the lower member and recessesin the face of the upper member which is directed towards the lowermember and projections on the lower member in register with the recessesand adapted positively to displace tongues on the stencil heading tobring the free edges of the tongues into position against the forwardlimits of said recesses.

In testimony whereof I have signed my name to this specification.

GEORGE ERNEST CREED.

